My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run the HVAC at all.
I'd like a thermostat with a filter-change reminder that is based on how long the filter has been in use, not how long it has been installed. That is, I'd like only the time when the blower is on to count against the filter's lifetime. Is there a product like this?
For instance, does this unit count time in this way?